Apparatus for the electrical transmission of power



(No Model.)

T. A. EDISON.

APPARATUS FOR THE ELECTRICAL TRANSMISSION OF POWER. NUI2Q5J86. wPatented 0011. 10.1882.

WITNESSES INVENTOR:

/WM fly/WM ATTORNEY.

N. PUERS. Pholmhlhuglnphnr Wnslwlglon. \t'v C.

UNITED STATES PATENT OEEIcE.

THOMAS A. EDISON, OF MENLO PARK, NEW JERSEY.

APPARATUS FOR THE ELECTRICAL TRANSMISSION OF POWER.

SPECIFICATION forming part of Letters Patent No. 265,786, dated October10, 18152.

Application filed August 7, 1882. (No model.)

To all whom it may concern:

Be it known that I, THoMAs A. EDISON, of Menlo Park, in the county ofMiddlesex and State of New Jersey, have invented a new and usefulImprovement in Apparatus for the Electrical Transmission of Power, (CaseNo. 423 and I do hereby declare that the following is a. full and exactdescription of the same, reference being bad to the accompanyingdrawings, and to the letters of reference marked thereon.

The object I have in view is to produce simple and efficient means fortransmitting power electrically Without a large investment inconductors, and for supplying independent translating devices withelectric current of lower tension than that flowing in the main circuit.This 1 accomplish by supplying a main circuit with a continuous currentof high tension by means of one or a numberoi' dynamo or mag netoelectric machines, and by arranging in series in this main circuit twoor more combined electro-dynamic motors and dynamoelectric generators,each of which has two sets of coils upon its armature, connected withindependent commutators. The brushes of one commutator are connectedwith the conductors ot' the main circuit, while those of the othercommutator are connected with conductors with which lamps, motors, orother translating devices are connected in multiple-arc circuits. Eachset of coils is a continuous winding upon a cylinder or ring, (theSiemens or Grainniewinding,) and one set is connected with the bars ofits comm utator-cylinder, so as to form with the common field-magnet acomplete motor or generator. A continuous current being passed througheither set of armature-coils and through the tield-coils,the armaturewill be revolved and the other set of coils will generate a continuouscurrent by cutting the lines of force. One set of coils is in no sensesecondary to the other, since they may correspond in resistance and theelectro-inotive force of the generating-coils be the same as the dropcaused by the motor-coils. The fieldcircuit of each of these machines isa multiple arc circuit from the main circuit or from its ownlamp-circuit. Thus it will be seen that each of these machines will beboth a motor and a generator. The tension of the current in the maincircuit is much higher than that of the current in each lamp-circuit,and since the combined motors and generators will be located at or nearthe points of consumption, a great saving in conductors can beiuade,since the conductors of the main circuit (the onlyone that need beof any considerable length) can be small. Each combined motor andgenerator can be regulated independently to give the desired tension inthe circuit supplied by it,so that the same tension can be maintained inall the lamp-circuits or a different tension maintained in the same, soas to supply haltlights, if required. Any one of the combined motors andgenerators can be short-circuited by closing a shunt around it,in whichcase the electro-motive force could be reduced at the source of supply.

In the accompanying drawings, forming a part hereof, Figure l is anarrangement embodying the invention shown diagrammatically, and Fig. 2is a crosssection of a portion of the armature of one of the combinedm1- chines.

A represents a dynamo or magneto electric machine supplying a current ofhigh tension in the main circnitlZ, ora nuinberot' machines arranged inmultiple arc, in series, or in multipleseries could be used for thepurpose. The [ield ot' the machine A is supplied by a multiple-arccircuit, 3 4, from 1. 2, and the machine may be regulated in any knownway, preterably by shifting the comm utator-brushes or by varyingprimarily the strength of the fieldmagnet.

B O D represent machines which are combined electro-dynamic motors anddynamoelectric generators. Each machine has a cylindrical or annulararmature-core wound with two sets of continuous coils connected to twoindependent bar-cominutators,a b. The smaller commutator a is themotor-commutator, and the brushes resting uponit are connected with theconductors of the main circuit 1 2, while the larger commutator, b, isthat of the generating-coils,and the brushes bearing on it haveconductors connected with them, with which lamps or other translatingdevices,E,are con-' nected in multiple are. These conductors of thethree machines are represented by5 and 6, 7 and 8, and 9 and 10. Thefield-circuits ll 12- ot' the combined motors and generators aremultiple-arc circuits from 1 2; or each machine may supply its own fieldfrom the current gen erated by it. In Fig.2 the two sets of coils ofeach machine are shown. The inner or motor coils, 0, are connected withthe commutator a, while the outer or generating coils. d, are connectedwith the commutator b. Each of the combined motors and generators can beregulated independently of all others to give the desired tension ofcurrent in the translationcircuit supplied by it as a generator. Thiscan be done by-adjustingthe brushes on either commutator or by varyingprimarily the strength of the field-magnet.

A shunt-circuit (not shown) may be formed around each machine B, G, andD, provided with a switch for making and breaking the same, so that anyone of these machines can be cut out of circuit. If any machine were cutout of circuit, the electro-motiv'e force at the source of supply wouldbe reduced accordingly.

It will be understood, as before explained, that the independentwindings of each combined machine are of the Siemens or Gramme pattern,while the field-magnet is common to both.

Acontinuous current is used to operate each machine, while the currentgenerated by it is also continuous.

What I claim is- 1. The combination, with amain circuit having a currentof high tension, of two or more combined electro-dynamic motors anddynamoelectric generators arranged in series as motors in such maincircuit, and independent translation-circuits connected with thegenerating-coil of such machines and supplied thereby with currents oflow tension, substantially as set forth.

2. The combination, with one or more dynamo or magneto electric machinessupplying a main circuit with a current of high tension,

of two or more combined eleetrodynamic motors and dynamo-electricgenerators, each having two sets of armature-coils connected with twoindependentcommutators, one set of commuta-tor-brushes being in the lineof the main circuit and the other set connected with conductorsindependent of the main circuit, and translating devices arranged inmultiple'arc circuits from such independent conductors, substantially asset forth.

3. The combination, with the main circuit, havinga currentof hightension,ot'two or more combined elect-ro-dynamic motors anddynamoelectric generators arranged in series as motors in the maincircuit, and independent translation-circuits connected with thegeneratingcoils of such machines and supplied thereby with currents ofrow tension, each of said combined machines being adapted forindependent regulation, substantially as set forth.

4. The combination, with a main circuit, of two or more combinedelectro-dynamic motors and dynamo-electric generators arranged in seriesas motors in the main circuit, and inde pendent translation-circuitssupplied by such machines with currents of low tension, the coils of thefield-magnet of each combined machine being in an independent circuitderived from the main circuit, substantially as set forth.

5. The combined electro-dynamic motor and dynamo-electric generatordescribed, consisting of an armature having two independentcontinuouswindings connected with separate bar-comn'iuiators, and a field magnetor magnets common to both windings, substantially as set forth.

This specification signed and witnessed this 22d day of May, 1852.

THOMAS A. EDISON.

Witnesses:

Enw. G. ROWLAND. C. P. More

